[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell $ cd planets
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ touch real ; touch fictionnal ; touch inhabited
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls
arrakis.jpeg    earth.jpeg  jupiter.jpeg  neptune.jpeg  saturn.jpeg
coruscant.jpeg  fictionnal  mars.jpeg     pluto.jpeg    uranus.jpeg
cybertron.jpeg  inhabited   mercury.jpeg  real          venus.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ rm real; rm fictionnal ; rm inhabited
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls
arrakis.jpeg    earth.jpeg    mercury.jpeg  saturn.jpeg
coruscant.jpeg  jupiter.jpeg  neptune.jpeg  uranus.jpeg
cybertron.jpeg  mars.jpeg     pluto.jpeg    venus.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls
arrakis.jpeg    earth.jpeg    mars.jpeg     pluto.jpeg   uranus.jpeg
coruscant.jpeg  inhabited     mercury.jpeg  real         venus.jpeg
cybertron.jpeg  jupiter.jpeg  neptune.jpeg  saturn.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ mkdir fictionnal
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls
arrakis.jpeg    earth.jpeg  jupiter.jpeg  neptune.jpeg  saturn.jpeg
coruscant.jpeg  fictionnal  mars.jpeg     pluto.jpeg    uranus.jpeg
cybertron.jpeg  inhabited   mercury.jpeg  real          venus.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ cd real
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ mkdir telluric; mkdir gas-giants ; mkdir dwarf-planets
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ ls
dwarf-planets  gas-giants  telluric
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ cd ..
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ mv earth.jpeg jupiter.jpeg neptune.jpeg saturn.jpeg mars.jpeg uranus.jpeg venus.jpeg pluto.jpeg mercury.jpeg real/
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls
arrakis.jpeg  coruscant.jpeg  cybertron.jpeg  fictionnal  inhabited  real
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ mv arrakis.jpeg  coruscant.jpeg  cybertron.jpeg fictionnal/
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls
fictionnal  inhabited  real
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ cp real/mercury.jpeg real/pluto.jpeg real/venus.jpeg real/mars.jpeg inhabited/
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ cd fictionnal
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/fictionnal $ ls
arrakis.jpeg  coruscant.jpeg  cybertron.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/fictionnal $ cd ..
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls inhabited
mars.jpeg  mercury.jpeg  pluto.jpeg  venus.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ cp real/saturn.jpeg inhabited.
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls inhabited
mars.jpeg  mercury.jpeg  pluto.jpeg  venus.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ cp real/saturn.jpeg inhabited/
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ ls inhabited
mars.jpeg  mercury.jpeg  pluto.jpeg  saturn.jpeg  venus.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ rm real/pluto.jpeg inhabited/pluto.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ cd real ; ls
dwarf-planets  jupiter.jpeg  neptune.jpeg  uranus.jpeg
earth.jpeg     mars.jpeg     saturn.jpeg   venus.jpeg
gas-giants     mercury.jpeg  telluric
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ ls
dwarf-planets  jupiter.jpeg  neptune.jpeg  uranus.jpeg
earth.jpeg     mars.jpeg     saturn.jpeg   venus.jpeg
gas-giants     mercury.jpeg  telluric

[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ mv earth.jpeg mars.jpeg venus.jpeg mercury.jpeg telluric/
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ mv neptune.jpeg uranus.jpeg gas-giants/
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ cd ..

[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ mv real/telluric/mars.jpeg inhabited


[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/inhabited $ rm mercury.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/inhabited $ rm saturn.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/inhabited $ rm venus.jpeg
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/inhabited $ cp ../fictionnal/cybertron.jpeg .
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/inhabited $ cp ../fictionnal/coruscant.jpeg .

[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/inhabited $ cd ..
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ cd real
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ rm -r dwarf-planets/
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets/real $ cd ..
[paul.d@MacBook-Pro-de-Paul] ~/quetes/shell/planets $ tree
.
├── fictionnal
│   ├── arrakis.jpeg
│   ├── coruscant.jpeg
│   └── cybertron.jpeg
├── inhabited
│   ├── coruscant.jpeg
│   ├── cybertron.jpeg
│   ├── earth.jpeg
│   └── mars.jpeg
└── real
    ├── gas-giants
    │   ├── jupiter.jpeg
    │   ├── neptune.jpeg
    │   ├── saturn.jpeg
    │   └── uranus.jpeg
    └── telluric
        ├── earth.jpeg
        ├── mars.jpeg
        ├── mercury.jpeg
        └── venus.jpeg